When Sherlock and Watson are in the kitchen talking, Watson puts the kettle on the hob, then gets a mug out and puts it on the counter. Several times when the camera pans back to Watson the mug has moved to the opposite side of her mobile phone, then back again.
In the first scene when the woman is pointing a gun at her own face, her thumb is clearly shown to be directly on the trigger when viewed from the side. In the next shot, the gun and her hand are viewed head on but now the piece of cloth is in between her thumb and the gun's trigger.
When Holmes hears that Bundsch has a second home on Oneida Lake, he immediately thinks of contacting the Onondaga County Sheriff and traveling to Syracuse, but Oneida Lake is in Oneida and Oswego counties. It's Lake Onondaga that's in Onondaga County and near Syracuse.